mgf down on power?

[cushT]

The initial message was deleted from this topic on 23 April 2009 at 16:11

[cushT]

My mg seems to be very low on power. When i put my foot down it often has a flat spot just as i press the pedal, & the induction noise seems very loud with little power.

My first thoughts were head gasket but there in no oil/water mix & there appears to be no preasure building up in the expansion bottle & no coolant loss?

It is also ticking over around 1200 rpm but occasionaly rests at normal tickover. Very strange.

Maybe i have an air leak? Does anybody know where i should start looking! Im new to the K series & know very little about them!

Thanks!!!

Edited by cushT on Thursday 23 April 16:21

[cushT]

Well, i pulled the plugs out & compression tested it, to make sure the head gasket isnt on its way & all is fine.

When i accelerate steadily the engine picks up, but if i put my foot hard down it just makes a loud induction roar & does not accelerate?

Can anyone shed any light on it? i have no idea where to start!

[esselte]

Have you tried the throttle position sensor?

[cushT]

I havent tried another tps no, i was going to pop to the scrap yard tomorrow & grab a few bits & pieces to try so i will make sure i get one.

Fuel deliver is fine too, & there is no change with the air box/filter removed...

[cushT]

Today i tried a new throttle position sensor, pressure regulator, idle control valve & a complete throttle assembly.

Its still doing it! Help!!!!

[MGRacer]

Funny you should mention your idle problems - currently trying to sort them on my race F.

Right - It might be the temp sensor (brown) on the right hand side of the engine as you look down on it with the engine cover removed.

It might also be the manifold cracking and therefore leaking around the flange as it attaches to the down pipe. (Mine broke completely at the weekend in qualifying)

The power issue might be down to the catalyst breaking up in the exhaust - had that one happen as well, last year.

Thats about as many suggestion, other than the one you have already done, I can come up with.

[cushT]

Thanks very much for that! much appreciated.

I never mentioned it before, but my exhaust whistles & has done for sometime, bits of cat might explain that do you think?

I will investigate tomorrow & will let you know how it goes. thanks again!

[cushT]

Thanks very much for your help! It was the cat falling apart inside. I removed it & half of it fell out of the end. A quick run without it fitted showed acceleration is back to normal.

New cat tomorrow i think.

Thanks again, much appreciated

[esselte]

cushT said:

Thanks very much for your help! It was the cat falling apart inside. I removed it & half of it fell out of the end. A quick run without it fitted showed acceleration is back to normal.

New cat tomorrow i think.

Thanks again, much appreciated

Glad you got it sorted...